#include <Wire.h>
#include <Adafruit_INA219.h>
#include <LiquidCrystal_I2C.h>

Adafruit_INA219 ina219;
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
  Serial.begin(9600);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Hello, world!");
  if (!ina219.begin()) {
    Serial.println("INA219 not found");
    while (1) {
      delay(10);
    }
  }
  // To use a slightly lower 32V, 1A range (higher precision on amps):
  //ina219.setCalibration_32V_1A();
  // Or to use a lower 16V, 400mA range (higher precision on volts and amps):

  ina219.setCalibration_16V_400mA();  // Set calibration for INA219
  delay(2000);
  lcd.clear();
}

void loop()
{
  float shuntVoltage = 0;
  float busVoltage = 0;
  float current_mA = 0;
  float loadVoltage = 0;
  float power_mW = 0;

  shuntVoltage = ina219.getShuntVoltage_mV();  // Read shunt voltage
  busVoltage = ina219.getBusVoltage_V();  // Read bus voltage
  current_mA = ina219.getCurrent_mA();  // Read current
  power_mW = ina219.getPower_mW();  // Read power
  loadVoltage = busVoltage + (shuntVoltage / 1000);  // Calculate load voltage

  Serial.print("Bus Voltage:   ");
  Serial.print(busVoltage);
  Serial.println(" V");
  Serial.print("Shunt Voltage: ");
  Serial.print(shuntVoltage);
  Serial.println(" mV");
  Serial.print("Load Voltage:  ");
  Serial.print(loadVoltage);
  Serial.println(" V");
  Serial.print("Current:       ");
  Serial.print(current_mA);
  Serial.println(" mA");
  Serial.print("Power:         ");
  Serial.print(power_mW);
  Serial.println(" mW");
  Serial.println("");
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("VxI=");
  lcd.print(loadVoltage);
  lcd.print("Vx");
  lcd.print(abs(current_mA));
  lcd.print("mA");
  lcd.setCursor(0, 1);
  lcd.print("P = ");
  lcd.print(power_mW);
  lcd.print("mW");
  delay(2000);  // Delay for 2 seconds
}